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(No Model.)

s. KENDALL.

ORE UONGENTRATOR.

No. 250,261. Patented Nov. 29,1881.

UNITED STATES PATENT Option.

STEPHEN KENDALL, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE- HALF TO LOUIS W. BEAUMAN.

ORE-CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 250,261, dated November 29, 1881, Application filed Septemberlfl, 1881. (No model.)

To all whom it may concern:

Be it known that I, STEPHEN KENDALL, of the city and county of San Francisco, State of California, have invented an Improved Concentrator and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to that class of ore-concentrators known as percussion-table concentrators;

Myimprovements consist in providing at the upper end of the table a laterally-extending depression or receptacle provided with a removable perforated cover, the water beingled into this receptacle by suitable means, so-as to flow upward through the perforations and onto the surface of the table, meeting the ore, which is moved toward the receptacle by the peculiar jar imparted to the table. The sulphurets or other heavy concentrations which are caught in the receptacle or depression by droppingthrough the perforations may pass ofl through a pipe or tube on the end of the receptacle but the opening for this discharge-pipe being a short distance above the bottom of said receptacle, the heaviest of the concentration-such as amalgam, floured quicksilver, &c.will remain in the depression and not pass off with the sulphurets. In this way a double concentration is effected at the one operation, the sulphurets being separated from the gangue and the amalgam being separated from the sulphurets.

My invention further consists in certain details of construction, as is more fully described hereinafter.

Referring to the accompanying drawings, Figure l is a perspective view. Fig. 2 is a longitudinal vertical section. Fig. 3 is a detail of construction.

The percussion table A is suspended by means of adjustable rods or links B on pivoted cross -bars C, mounted on a frame, D. The rods or links are hinged or pivoted to the shaking-table, and their upper ends are threaded, so that a nut, E, is employed to hold them in any desired position. By means of these nuts and rods any desired angle may be given to the table. The movable cross-bars C are provided at their ends with pivots C, consisting of pointed rods. On the frame D are placed plates 0, having sockets or depressions at regular intervals, into which the pivots C fit. By moving the pivots C of the cross-bars G into different corresponding sockets more or less percussion is given to the shakin g-table. When the pivots are in the sockets nearer the upper end of the frame, more ofa shock is given to the table by the cam than when the table is hung farther away from the upperend of the frame. In this way I can regulate the strength of the blow given to the percussion-table in accordance with the requirements of the ore, since the farther the table swings back the greater the jar or blow. There being a great deal of jar to the table, ordinary nuts are apt to work loose, and I have therefore hinged a lever or catch, 6, to the nuts E, and these drop into notches in the notched plates 0 and hold the nuts in any desired position. The catch 0 also answers as a stationary wrench for the nuts.

The pocket or receptacle F across the top of the table, I have shown as semicircular in form; but it may be made in any shape. It is formed below the level of the table, and is pro- 7 5 vided with a cover, F, having perforations f, as shown, this cover setting flush with the surface of the table. At one end of the receptacle is the discharge-pipe G, which opens a short distance above the bottom, as shown, for the purpose hereinafter described.

Water is admitted through the pipe H, provided with a suitable regulating-cock. This water is led into the pocket or receptacle in any suitable manner; butI prefer to lead itin through a slot, h, in the body of the frame, this water comingin under the cover of the pocket and passing out through the perforationsin the cover, and then on down the table in the usual way. go

On the frame, at the rear or upper end of the table, is a shaft, I, having a pulley, J, and cam K, this shaft and cam giving the requisite forward motion to the table. Its backward motion is accomplished by gravitation, no 5 springs being used, the shaking-table being suspended in such a manner as to move freely.

The operation of my device is as follows: The ore is fed onto the table in the usual way.

I prefer to have the lower portion of my table made with less of an incline than the upper,

and the upper portion is therefore steeper, as

shown, because in this way I can accomplish a more perfect separation. The water flows more slowly at the lower part, and by a change in the pitch of the table at the upper end I get the sulphurets well cleaned of gangue. The water is admitted through the pipe, and passes into the pocket or receptacle at the upper end of the table, thence passing up through the perforations in the cover and meeting the concentrations in its way. Coming up, as it does, from below,itis allowed to flow smoothly onto the table without any wash or sudden fluctuating motion. It flows more slowly on over the incline, cleaning the already partly concentrated portions as they are moved upward by r the effect of the percussive blow of the table in its backward motion and sudden stop. As the water reaches the less inclined portion it performs its office of concentrating the material, carrying off the gangue, while the sulphurets, mercury, and amalgam, settling down, are jarred back toward the upper end. The heavier particles come on up and pass through the perforations in the cover into the receptacle or pocket. From this the sulphurets may be drawn oft at any time through the discharge-pipe; or this pipe may be left open, so that the concentrates will discharge themselves. The amalgam, floured mercury, and gold will remain in the pocket below the discharge-opening, and when the sulphurets are removed the cover may be taken off and the amalgam and other heaviest material may be taken out.

I am aware that a reciprocating trough or sluice provided with a receptacle secured to and arranged beneath said trough and in communication therewith is not new, and such therefore, broadly, I do not claim.

This construction admits of acontinuous discharge of both the sulphurets and tailings, and, as hereinbefore stated, admits also of a double concentration.

I am aware that percussion-table concentrators have heretofore been constructed with transverse recesses or pockets at their upper ends for holding the concentrated material, and I do not therefore claim, broadly, said pocket or receptacle; but

What I do claim as new,and desire to secure by Letters Patent, is

1. A percussion-table concentrator having a transverse pocket or receptacle provided with a perforated cover opening into the bottom of the table, and with ingress and egress pipes for the water, the whole arranged in the manner and for the purpose substantially as described.

2. In combination with a percussion-table concentrator, the pocket or receptacle F, having a perforated cover. F, through which the concentrations are admitted to the said receptacle, and havinga side or end discharge above its bottom, whereby the concentrated sulphurets may be discharged as collected, while the amalgam and mercury are retained separate, substantially as herein described.

3. In combination with the adjustable links or rods 13 of a suspended percussion-table concentrator, the nut-locks, substantially as described, whereby said nuts are prevented from jarring loose and allowing the rods to alter the inclination of the table, substantially as her in described.

4. In combination with .the percussion-table A, suspended on rods or links B, and given an end percussion motion by means of a cam, K, the movable pivoted suspending-bars G, havin g pivots 0, and the socketed plates 6, whereby the throw of the table and strength of percussive blow may be regulated, substantially as herein described.

In witness whereof I have hereunto set my hand.

. STEPHEN KENDALL.

Witnesses:

GEO. H. STRONG, FRANK A. BROOKS. 

